1. Sanded yesterday's filler. 2. Inspected the entire cowl (upper and lower) for divots and larger pinholes. Filled them all. 3. I noticed a while ago that I'd installed the heat shield material inside the lower cowling right up to the edge of the cowl. This left no room to apply the same bead of high-temp RTV the rest of the heat shield has. So today, I used a sharp knife to trim off the heatshield about 1/8" away from the edge. This gave me enough room to apply a bead of RTV and smooth it out, without getting any on the edge. This will be important for painting.